Apparatus for purifying blast-furnace gas.



, H. SAVAGE. APPARM'U QR PURIPYING BLAST PURN E GAS.

PLIOATION FILED JULY 14, 1908.

94,664; atented Feb. 8, 1910.

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HUGH SAVAGE, OI SERAING, BELGIUM.

APPARATUS FOR PURIFYING BLAST-FURNACE GAS.

Specification of Letters Patent.

Patented Feb. 8, 1910.

Application filed July 14, 1908. Serial No. 443,553.

To all whom it may concern:

Be it known that I, HUGH Snvnen, a subject of Great Britain, residing at Seraing, in the Kingdom of Belgium, have invented new and useful Improvements in Apparatus for Purifying Blast-Furnace Gas, of which the following is a specification.

This invention relates to apparatus for purifying blast-furnace gas and has for its object to improve the construction of this class of apparatus for the purpose of treat ing great quantities of gas by means of a centrifugal fan but without necessitating, generally speaking, the use of water.

The improved apparatus is adapted to be used principally to cleanse the gas from the main part of heavy and solid dusts which are carried with it at its exit from the blastfurnace and according to the improvements this separating operation may be,advantaeously performed by the aid of centrifu al force and without the use of finely divi ed I water which requires a great consumption of motive power and restricts the capacity of the apparatus. At its exit from the im proved apparatus the gas. is adapted to be burned in boiler-furnaces and is in very suitable condition to be further purified in a cleansing apparatus working with finely divided water if it is to be used in gas engines.

The invention consists essentially in the special arrangement and combination of respectively wings 7) and 7/.

parts will be hereinafter fully described and pointed out in the appended claims.

In the annexed drawing: Figure 1 is a vertical longitudinal section of an apparatus constructed accordin to the invention. Fig. 2 is a plan View of the same. Fig. 3 is' a developed section of the apparatus taken .on line III-IIIIV of Fig. 1, showing, on a larger scale the details of the apparatus and the course of the gas through the apparatus.

A is the gas inlet orifice and A the gas outlet orifice of the a paratus which comprises a centrifugal fan the movable member B of which is carried on a rotating axis (1 which is driven by an electromotor M or by any suitable meausf The movable member or wheel B of theccnti'ifugal fan is divided in two parts by a solid wall D placed at right angles on the rotating axis (1 and on each side of which are located The wheel B is inclosed lay a casing E completely closed pipe, the gas is sucked in the centrifugal fan by the wings of the wheel B and is subjected to centrifugal action and thrown to the periphery of the casing E, in such a manner that it'can only escape through the outlet orifice A after having circulated from the periphery to the center of the second part of the wheel B comprising the wings I).

Theoretically speaking, the speed of the i gas at its entrance into the apparatus and at its exit therefrom should be the-same but, on account of the resistances which oppose the passage of the gas, the speed at the outlet orifice A would be reduced if the two parts I) b of the wheel B on each side of the wall D had exactly the same diameter. In order to avoid the said loss of speed, the part of the wheel on the inlet side comprising the wings I; is constructed of a greater diameter than the second part comprising the'wiugs b, in such a manner that a positive difference of pressure is produced atthe periphery of the first part gwings o) of the wheel B, which difference 0 pressure facilitates the entrance of the gas in the second part of the wheel B (wings 1)) ,and also the exit through the outlet orifice A. The fact that the wings b have a larger diameter than the wings b, develops a difference of pressure or force sufficient to preserve a rapld flow of the gas through the apparatus. This is artly because the fan rotates at high velocity, and partly because there is no resistance to the flow except the friction of the walls of the passages, and as the passages are large, this friction is slight.

The amount of power consumed in the apparatus s of course, directly proportional to the di erence of pressure produced by the wings I) and the Wings. 11, and by making this difference small, the power ronsumption is proportionately reduced. Nevertheless a high velocity of the gases is att ained in the apparatus, this latter fact being necessary in order to remove'the ore particles as hereinafter described.

On account of their density, the solid or liquid particles of dust are violently pro can be intensified if desired, by injections of,

water through the water inlets Z at the periphery of the casing E, but it is to be noted that, in this case, said water is not subjected to the centrifugal action with the gas, said water forming a layer on the casing. E and being used to retain the dust or to condense the liquids which may be contained in the gas which is to be purified. The fact that said water is not subjected to the centrifugal action secures a great economy of motiv power.

Having thus described my invention what I clalm 1s:

1'. In an apparatus .of the class described,

the combination of a fixed casing having a central inlet opening on one side and a central outlet opening on the other side, a shaft rotatable in' said casing, a wall. or disk fixed to said shaft in a transverse plane thereof, and wings on each side of said wall or disk, the wings facing the inlet side of the casing having a greater diameter than those facing the outlet side of the casing.

2. In an apparatus of the class described, the combination of a fixed casing having a central inlet opening on one side and an out- 'let 0 ening on the other side, a collecting at the periphery of the wings having the greater diameter.

8. In an-apparatus of the class described, the combination of a centrifugal fan comprising a wheel, a rotating shaft carrying said wheel, a wall or disk fixed to said shaft, wings on either side of said wall, a closed casing surrounding said wheel, a collecting vesselformed at the lower part of said casing, said wheel having an inlet orifice on one side and an outlet orifice on the other side, the wings on the inlet side of the Wheel having a diametcrgreater than the wings on the outlet side of the wheel, whereby an excess of pressure is produced at the periphery of the lnlet side of the wheel to facilitate the entrance of the gas in the outlet side of the wheel.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

H. SAVAGE. 

